Chrysogonum virginianum

RHS Plant Profile
golden knee

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Other common names

golden star

Herbaceous Perennial Alpine Rockery
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A spreading, mat-forming perennial to a height of 25cm, with oblong, heart-shaped slightly hairy green leaves. In mild winters it is evergreen. Flowers appear from early spring to late summer and are five-petalled and yellow

Position

Full sun, Partial shade

Soil Types

Sand, Loam, Chalk

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.1-0.5 metres

Growing Conditions

Sand Loam Chalk
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
West–facing or South–facing or North–facing or East–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Matforming
Genus
A genus of mat-forming, low-growing, rhizomatous semi-evergreen perennials with toothed, dark green foliage and star-shaped, bright yellow flowers in spring
Name Status
Correct
Plant Range
E USA

How to Grow

Cultivation

Grow in a woodland-type environment - deep moist soil enriched with leaf mould or other soil conditioner. Grow in sun or partial shade

Propagation

Propagate by seed, in a cold frame or sheltered place outside, as soon as ripe. Divide runners in spring or autumn

Suggested planting locations and garden types

  • Banks and slopes
  • Flower borders and beds
  • Ground cover
  • Underplanting of roses and shrubs

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free